3 Things to Know: August 3

1

On Tuesday, Stan Wawrinka withdrew from the Rio Olympics because of an injury, not saying exactly what the ailment was. The world No. 4’s management company issued a statement that he “felt increasing pain” in Toronto and was told by doctors to “reduce his physical activity for an undetermined period.” Half of the men’s Top 10 will be missing in Rio.

2

On Tuesday, the US Open unveiled the Arthur Ashe Stadium roof superstructure, but not without a glitch. It took Billie Jean King three tries—and 20 minutes of U2’s Beautiful Day—before the roof retracted. It was the first official opening of the new $150-million, 6,500-ton addition to the stadium. Check out the comprehensive photo gallery.

3

Seven American men are in the second round of Atlanta, led by top seed John Isner. In the first round,teenager Reilly Opelka beat fellow American (and qualifier) Chirstopher Eubanks, while Taylor Fritz topped Austin Smith. Fritz will face another American in Bjorn Fatangelo. Tim Smyczek will take on seventh-seeded Donald Young, while Jared Donaldson will have his hands full with No. 2 seed Nick Kyrgios.